should do so because, as I have just remarked, this is the position of the Full Moon as it is always seen with the naked eye or with a simple binocular, for the latter does not reverse it, as does a telescope. The western edge is now at the right hand, and the north at the top. All the _mares_ are clearly visible. On the right the _Mare Crisium_, the _Mare Fœcunditatis_, the _Mare Nectaris_ and the _Mare Tranquillitatis_; in the center, above, the _Mare Serenitatis_; on the left the _Mare Imbrium_, the _Mare Vaporum_, the _Mare Nubium_, the _Mare Humorum_, and the _Oceanus Procellarum_. The two bright spots on the right, lower than the _Mare Fœcunditatis_, are Petavius and a neighboring ring. Vendelinus forms a less brilliant spot at the western edge of an extension of the _Mare Fœcunditatis_, and Langrenus is distinctly seen on the western shore of the main body of that _mare_. Proclus and the remarkable diamond of the ‘Marsh of a Dream’ are very plain just under the large oval of the _Mare Crisium_. The mountains and cliffs encircling the _Mare Imbrium_ on the west, north, and east you will recognize at a glance. The dark Plato is conspicuous in the lighter mountainous area north of this ‘sea,’ and the semicircle of the ‘Bay of Rainbows’ is sharply defined. Farther north is the long, dark _Mare Frigoris_, whose eastern end merges into the broad _Oceanus Procellarum_. Aristarchus appears as a very bright point in this ‘ocean,’ and far to the right of Aristarchus, toward the center of the disk, Copernicus, with its splatter of irregular rays, is conspicuous. Following the eastern limb round toward the south we see again the dark oval of Grimaldi, beyond which the bright mountainous region broadens as we approach the South Pole. [Illustration: NO. 13. SEPTEMBER 5, 1903; MOON’S AGE 14.40 DAYS. ]